Some cracking stats there.
From my experience the Prom is quickest on a calm day, followed by PP then Hove.
The stats lie and you have the correct order.
Being oldest Hove Park has had more runs and so had all the best runners for a number of years and even now is favoured by the faster club runners on average.
Hove Prom was 17:03 yesterday almost a minute behind Hove Park despite being the faster course. Not sure on PP.